docker: install and download methods for macos and windows

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/util.ts

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
+import fs from 'fs';
 import * as core from '@actions/core';
+import * as io from '@actions/io';
 import {parse} from 'csv-parse/sync';
 
 export interface InputListOpts {
@@ -71,4 +73,26 @@ export class Util {
     }
     return true;
   }
+
+  public static async powershellCommand(script: string, params: Record<string, string>) {
+    const powershellPath: string = await io.which('powershell', true);
+    const escapedScript = script.replace(/'/g, "''").replace(/"|\n|\r/g, '');
+    const escapedParams: string[] = [];
+    for (const key in params) {
+      escapedParams.push(`-${key} '${params[key].replace(/'/g, "''").replace(/"|\n|\r/g, '')}'`);
+    }
+    return {
+      command: `"${powershellPath}"`,
+      args: ['-NoLogo', '-Sta', '-NoProfile', '-NonInteractive', '-ExecutionPolicy', 'Unrestricted', '-Command', `& '${escapedScript}' ${escapedParams.join(' ')}`]
+    };
+  }
+
+  public static isDirectory(p) {
+    try {
+      return fs.lstatSync(p).isDirectory();
+    } catch (_) {
+      // noop
+    }
+    return false;
+  }
 }